OTTAWA - If there's one issue that unites Idle No More protesters, Attawapiskat Chief Theresa Spence and militant and moderate First Nations alike, it is the federal government's recent changes to environmental oversight.

But the united stand among First Nations, grassroots and environmentalists has been met with an equally adamant federal government that appears unwilling to budge, forming the battle lines for an extended conflict.

"Our fights may be different, but our dreams and hopes for our people are common," Spence said in a statement posted Wednesday, thanking Idle No More for bringing awareness to the new environmental laws and urging unity among First Nations.

Prime Minister Stephen Harper, however, is not blinking.

"The government has no plans to reconsider its legislation," the prime minister's spokesman, Andrew MacDougall, said bluntly in an email Wednesday.

While there may be room to negotiate with Ottawa on other issues that have driven First Nations people into the streets in protest, the division over how to handle resource development and the environment is deep and entrenched.

Wednesday's day of action included traffic disruptions and public demonstrations across the country, but remained peaceful. Some chiefs, warn of blockades if material changes aren't made soon. And Spence's liquids-only hunger protest persists.

At issue are two huge and complicated pieces of legislation stemming from last year's budget, of which more efficient natural resource extraction was the centrepiece.

Bill C-38, which passed in June, completely overhauls Canada's environmental assessment law, redefines protections for fish and gives the federal cabinet new decision-making powers on resource development.

Environmentalists and First Nations alike say the changes allow mining and energy companies to steamroll over their concerns, and rush into resource extraction without properly accounting for harm to animal habitats.

But an analysis by lawyers at Fraser Milner Casgrain says the changes also impose new responsibilities on corporations when it comes to dealing with First Nations. Plans for resource extraction will need to take into consideration any effect on aboriginal health, socio-economic conditions, physical and cultural heritage, and historical sites.

C-45, the second omnibus budget bill, received royal assent in December. It overhauls protections of waterways by dramatically changing the Navigable Waters Act, as well as changing the Fisheries Act and the Hazardous Materials Information Review Act.

"Is this the appropriate thing to do for the economy at the expense of future generations?" said Ontario Regional Chief Stan Beardy, protesting Wednesday along with hundreds of others alongside a northern Ontario highway, shouting to be heard over a line of transport trucks slowed by the demonstration.

"We want to have a source of clean drinking water."

Behind the scenes, there may be some wiggle room as the federal government goes about crafting regulations on how to implement C-45. Harper and his officials indicated as much to chiefs who met with him and several cabinet ministers last week, insiders say.

"The PM did say that the law is now passed, but the regulations in many cases still need to be worked out, and that will involve consultation," said one government official, speaking on condition of anonymity.

That's unlikely to do much to assuage the deep concerns shared by environmentalists and First Nations, said Megan Leslie, the NDP environment critic.

"The Conservatives could certainly say we'll add that lake or river to the (protected waters) list," she said. "But that's tinkering around the edges. They (chiefs and protesters) are concerned with the overall omnibus bill."

Still, she said the Conservatives have shown that they will move on legislation if they think it's not right. Included in C-45, for example, were two major changes to the just-passed C-38.

"I think there's absolutely room to figure out what to do here," Leslie said.

Companies need a solution just as much as First Nations and environmentalists, added Anna Baggio, director of conservation land use planning with CPAWS Wildlands League.

Baggio is on the front lines of proposed mining development in northern Ontario, and she sees companies working hard to get the 'social license' they need to obtain First Nations support and go ahead with resource extraction.

If the public does not have confidence in the government's environmental oversight, businesses will find it even more difficult to proceed, she said.

"From a big business standpoint, if the government wants 'responsible resource development', there are things you have to put in place to be sure it is responsible."

But even if Harper stands his ground and does not entertain changes to the two omnibus bills, First Nations have two more cards to play, Beardy said.

For one, the protest movement has only just begun and will amplify once the weather warms up, he said. His northern Ontario group was on the highway for hours Wednesday in -15 C temperatures.

"Something has to be really wrong to do that," Beardy said.

Plus, aboriginal people still have legal rights that will likely trump the most recent federal legislation, he added, pointing to protections of aboriginal rights in the constitution.

Indeed, there is already one lawsuit, with two Alberta First Nations asking for a judicial review of the bills, claiming the federal government did not fulfil its duty to consult with First Nations before passing the legislation.

Forcing First Nations to go to court is not a sustainable response, Leslie said.

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  • A native dancer looks on during an 'Idle No More' gathering on Parliament Hill in Ottawa on Monday, Jan. 28, 2013. THE CANADIAN PRESS/Sean Kilpatrick

  • Native dancers rally during an 'Idle No More' gathering on Parliament Hill in Ottawa on Monday, Jan. 28, 2013. THE CANADIAN PRESS/Sean Kilpatrick

  • Idle No More Mall Protest

    <a href="http://www.huffingtonpost.com/social/LJ_Henshell"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/630755180/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/LJ_Henshell">LJ Henshell</a>:<br />A First Nations Drummer plays during a protest at Intercity Shopping Center in Thunder Bay, Ontario

  • It's about the future

    <a href="http://www.huffingtonpost.com/social/LJ_Henshell"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/630755180/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/LJ_Henshell">LJ Henshell</a>:<br />A child protests in Thunder Bay, Ontario

  • United we stand

    <a href="http://www.huffingtonpost.com/social/Doug_Cleverley"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/805699678/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Doug_Cleverley">Doug Cleverley</a>:<br />At the #IdleNoMore rally in Owen Sound (Saugeen Ojibway Nation territory), during a spontaneous round dance at the main downtown intersection.

  • Killer Whale Dance

    <a href="http://www.huffingtonpost.com/social/Courtney_Harrop"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4441016.png" /></a><a href="http://www.huffingtonpost.com/social/Courtney_Harrop">Courtney Harrop</a>:<br />Idle No More actions, Coast Salish Territories, Powell River, BC

  • Idle No More #J11

    <a href="http://www.huffingtonpost.com/social/Courtney_Harrop"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4441016.png" /></a><a href="http://www.huffingtonpost.com/social/Courtney_Harrop">Courtney Harrop</a>:<br />Coast Salish Territories, Powell River, BC

  • Idle No More #J11 March

    <a href="http://www.huffingtonpost.com/social/Courtney_Harrop"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4441016.png" /></a><a href="http://www.huffingtonpost.com/social/Courtney_Harrop">Courtney Harrop</a>:<br />Coast Salish Territories, Powell River, BC

  • Tla'Amin Prayer Song #J11 Idle No More

    Tla'Amin Prayer song on #J11 2013 Idle No More, Coast Salish Territories, Powell River BC

  • Tla'Amin Killer Whale Dance, #J11 #IdleNoMore

    Tla'Amin Killer Whale Dance, #J11 #IdleNoMore, Coast Salish Territories, Powell River, BC

  • C45 affects all Canadians! Join the fight.

    <a href="http://www.huffingtonpost.com/social/Eleanor_Kure"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/840875359/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Eleanor_Kure">Eleanor Kure</a>:<br />At the Idle No More protest in Halifax Nova Scotia. with an eco-justice article in pocket, spreading the word that Bill C45 affects every Canadian, not only First Nations. Thank you FN, for beginning this movement.

  • Piyesiw Awasis

    <a href="http://www.huffingtonpost.com/social/mizzren"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/3183681.png" /></a><a href="http://www.huffingtonpost.com/social/mizzren">mizzren</a>:<br />Thunderchild First Nation @ Lloydminster Flash Mob. January 16, 2013

  • <a href="http://www.huffingtonpost.ca/2013/01/16/idle-no-more-queen-elizabeth-2-highway-blockade-alberta_n_2490009.html">Idle No More supporters jump onto a truck</a> as they are pushed by a driver trying to pass, as the protesters block Highway 2 as part of a planned national day of action, in Edmonton, Alberta on Wedneday January 16, 2013.

  • Aboriginal protesters march down Huron Church Road towards the Ambassador bridge in Windsor Ontario, Wednesday, January 16, 2013. About 1000 demonstrators disrupted traffic to the country's busiest border crossing for several hours.

  • Aboriginal protestors pray at the end of their blockade of a CN railroad track just west of Portage La Prairie, Man., on Wednesday, January 16, 2016. They ended their protest without incident.

  • Aboriginal protesters demonstrate at the base of the Ambassador Bridge in Windsor Ontario, Wednesday, January 16, 2013. About 1000 demonstrators disrupted traffic to the country's busiest border crossing for several hours.

  • Idle No More demonstrators block a CN east-west track just west of Portage La Prairie, Manitoba Wednesday, January 16, 2016.

  • Mississaugas of the New Credit support INM

    <a href="http://www.huffingtonpost.com/social/Vicki_King_Jamieson"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/750500023/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Vicki_King_Jamieson">Vicki King Jamieson</a>:<br />New Credit Youth supporting INM

  • Montreal Idle No More

    <a href="http://www.huffingtonpost.com/social/Caillum"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/Caillum">Caillum</a>:<br />Thousands of people, both Native and Canadian, show their support at an Idle No More protest in Montreal on January 11th, 2013.

  • #Denendeh #J11 #IdleNoMore #YZF #NWT Yellowknife "Northwest Territories"

    Video of the Global Day of Action rally in downtown Somba K’e (Yellowknife)on the Akaitcho territory of the Yellowknives Dene First Nation in Denendeh (Northwest Territories).

  • #IdleNoMore March and Round Dance in Yellowknife Denendeh NWT

    "Today (Friday, December 21, 2012) in Denendeh and across the globe, we made an impact, a statement for true justice to be brought forward and acknowledged. But it will not stop, for the 8th fire has been lit and will only grow. Mahsi for all who showed up and united, we felt the support....we felt the fire!! And there's more to come in the new year." On Facebook By Lawrence Nayally, Melaw Nakehk'o and Eugene Boulanger https://www.facebook.com/events/112403725595655/

  • Attawapiskat Chief Theresa Spence, wearing a headdress, takes part in a drum ceremony before departing a Ottawa hotel to attend a ceremonial meeting at Rideau Hall with Gov. Gen. David Johnston in Ottawa, Friday January 11, 2013.

  • Attawapiskat Chief Theresa Spence, centre, departs a Ottawa hotel to attend a ceremonial meeting at Rideau Hall with Gov. Gen. David Johnston in Ottawa, Friday January 11, 2013.

  • Prime Minister Stephen Harper meets with First Nations leaders in Ottawa on January 11, 2013.

  • Prime Minister Stephen Harper meets with First Nations leaders in Ottawa on January 11, 2013.

  • Attawapiskat Chief Theresa Spence makes a brief statement on Victoria Island near Parliament Hill Friday January 11, 2013 in Ottawa. Spence is speaking out for the first time about how her reserve spends government money, saying most of what flows to her isolated James Bay reserve actually gets spent outside the community.

  • Aboriginal Chiefs stand at the main gate to Parliament Hill during a protest Friday January 11, 2013 in Ottawa.

  • Idle No More protesters listen to speakers during a rally on Parliament Hill Friday January 11, 2013 in Ottawa.

  • Gordie Odjig of Wikwemikong stands at the west gate to the Langevin Block during the aboriginal meeting in Ottawa on Friday, January 11, 2013.

  • Idle No More at UBC Vancouver

    <a href="http://www.huffingtonpost.com/social/Randall_Gray"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/100001602753648/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Randall_Gray">Randall Gray</a>:<br />

  • Idle No More at UBC Vancouver

    <a href="http://www.huffingtonpost.com/social/Randall_Gray"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/100001602753648/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Randall_Gray">Randall Gray</a>:<br />

  • Los Angeles Rally In Solidarity with First nations

    <a href="http://www.huffingtonpost.com/social/hp_blogger_Melinda Gopher"><img style="float:left;padding-right:6px !important;" src="http://www.huffingtonpost.ca/contributors/melinda-gopher/headshot.jpg" /></a><a href="http://www.huffingtonpost.com/social/hp_blogger_Melinda Gopher">HuffPost Blogger Melinda Gopher</a>:<br />Brock Conway, Blackfeet activist, with Saulteaux Actor Adam Beach and companion. Photo: Morning Star Gopher

  • Native protesters march up Wellington Street in Ottawa on Friday, January 11, 2013.

  • Four-year-old Phoenix Sky Cottrelle,from Aamjiwnaang First Nation, holds a sign as aboriginal protestors gather on Victoria Island before they march to Parliament Hill in Ottawa on Friday, January 11, 2013.

  • Aboriginal protestors hold signs as they march from Victoria Island to Parliament Hill in Ottawa on Friday, January 11, 2013.

  • Gordie Odjig, an aboriginal protestor from Wikwemikong, shouts as he marches from Victoria Island to Parliament Hill in Ottawa on Friday, January 11, 2013.

  • Woman's Voices

    <a href="http://www.huffingtonpost.com/social/Courtney_Harrop"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4441016.png" /></a><a href="http://www.huffingtonpost.com/social/Courtney_Harrop">Courtney Harrop</a>:<br />Idle No More event Dec 30th,2012. Tla'Amin Nation Coast Salish Territories Powell River, British Columbia.

  • Idle No More Edmonton

    <a href="http://www.huffingtonpost.com/social/AUPELOCAL6CHAIR"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4411530.png" /></a><a href="http://www.huffingtonpost.com/social/AUPELOCAL6CHAIR">AUPELOCAL6CHAIR</a>:<br />Planned overnight and what a turn out!

  • IdleNoMore March, Dauphin, Mb

    <a href="http://www.huffingtonpost.com/social/Phyllis_Racette"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/1354341984/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Phyllis_Racette">Phyllis Racette</a>:<br />#IdleNoMOre Dauphin, Mb

  • Chicago Idle No More @ the Canadian Consulate

    <a href="http://www.huffingtonpost.com/social/Jolene_Aleck"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/644015258/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Jolene_Aleck">Jolene Aleck</a>:<br />Chicago's Idle No More 1.5.2012 rally @ the Canadian Consulate

  • VancouverC Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • A man waves a flags as aboriginal protesters and supporters in the Idle No More movement block the Blue Water Bridge border crossing to the United States in Sarnia, Ont. on Saturday, January 5, 2013.

  • VancouverA Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • VancouverB Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • VancouverD Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • VancouverH Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC, January 2, 2013.

  • VancouverF Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • VancouverE Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • VancouverG Jan 2 2013

    <a href="http://www.huffingtonpost.com/social/gerrybates"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/gerrybates">gerrybates</a>:<br />Idle No More at Waterfront Station, Vancouver, BC

  • Flag Planting

    <a href="http://www.huffingtonpost.com/social/seawaytoday"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/seawaytoday">seawaytoday</a>:<br />Akwesasne Idle No More att Cornwall, ON

  • Dec 21st 2012 Idle No More Ottawa: Berdine

    <a href="http://www.huffingtonpost.com/social/Gail_Chicky_Gallagher"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/535670179/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Gail_Chicky_Gallagher">Gail Chicky Gallagher</a>:<br />